Messages in this thread Patch in this message | | | Date | Wed, 21 Aug 2019 21:09:12 +0200 | From | Thomas Gleixner <> | Subject | [patch V2 25/38] posix-cpu-timers: Provide array based sample functions |
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Instead of using task_cputime and doing the addition of utime and stime at all call sites, it's way simpler to have a sample array which allows indexed based checks against the expiry cache array.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- kernel/time/posix-cpu-timers.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
--- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -202,6 +202,32 @@ static u64 cpu_clock_sample(const clocki return 0; } +static inline void store_samples(u64 *samples, u64 stime, u64 utime, u64 rtime) +{ + samples[CPUCLOCK_PROF] = stime + utime; + samples[CPUCLOCK_VIRT] = utime; + samples[CPUCLOCK_SCHED] = rtime; +} + +static void task_sample_cputime(struct task_struct *p, u64 *samples) +{ + u64 stime, utime; + + task_cputime(p, &utime, &stime); + store_samples(samples, stime, utime, p->se.sum_exec_runtime); +} + +static void proc_sample_cputime_atomic(struct task_cputime_atomic *at, + u64 *samples) +{ + u64 stime, utime, rtime; + + utime = atomic64_read(&at->utime); + stime = atomic64_read(&at->stime); + rtime = atomic64_read(&at->sum_exec_runtime); + store_samples(samples, stime, utime, rtime); +} + /* * Set cputime to sum_cputime if sum_cputime > cputime. Use cmpxchg * to avoid race conditions with concurrent updates to cputime.
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